A scarce U.S. Army dosimeter radiation tactical EIR3. This metal cased unit is a great piece of Cold War history. Hinged lid opens to reveal five vials filled with solution, when shaken the windowed display shows the amount of roentgens (50, 125, 175, 300, and 450), has a metal clothing/webbing attachment to back. Unit is dated December 1954. Measures: 60mm x 88mm x 25mm (2.3" x 3.4" x 1").